Conditions For Clearing DTC
WARNING: This page is about a different car, the 2000 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.
DTC will be cleared when SDM detects correct operation and SIS sends a valid ID message to SDM. History DTC will clear once 255 malfunction free ignition cycles have occurred or CLEAR CODES command is issued via scan tool.